Pedestal-table lock.



A. CARLSON. PEDESTAL TABLE LOCK. APPLIUATIDH FILED mm 1, 1909.

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Patented Jan. 25, 1910. 2 sums-sum 2.

UNITED STATES arana OFFICE.

ALFRED OARLSON, OF JAMESTOWN, NEW YORK, ASSIGNOR OF ONE-HALF T0 NATIONAL FURNITURE COMPANY, OF JAMESTOWN, NEW YORK, A CORPORATION OF NEW YORK.

PEDESTAL-TABLE LOOK.

T 0 all whom it may concern:

Be it known that I, ALFRED GAnLsoN, a citizen of the United States, residing at Jamestown, county of Chautauqua, and State of New York, have invented new and useful Improvements in Pedestal-Table Locks, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

The invention relates to improvements in pedestal extension tables and particularly refers to a new and improved device for guiding and drawing together the opposing pedestal sections when the table is closed, and the invention consists in the construction and arrangement of the parts, as shown in this specification and the accompanying drawings and pointed out in the claims.

in the drawings, Figure 1 is a perspective view of one-half of the pedestal and table top having the main portion of the pedestal lock therein. Fig. 2 is a perspeclive view of the locking elements or the two engaging parts of the look as attached to the opposite sections of the pedestal at one side. Fig. 3 is a side elevation of the opposing parts including portions of the podestal as they approach one another, the upper portion being shown in section. Figs. at, 5, and 6 are perspective and plan views of the slot cam lever for drawing the parts of the pedestal together and locking the same, Fig. 1 showing a plan view of the slot cam lever in the raised or locked position, Fig. 5 showing a perspective view of the slot cam lever in a partially raised position; and Fig. (5 is a plan view oi the slot cam in the unlocked position. Fig. T is a side elevation of the locking elements which bind the parts together, said elements being shown in the closed position, the position of the hooked element being shown in dotted line. Fig. 8 is a top plan view of the 1 upper edges of the parts of the lock in position and approaching one another but not contacting, thereby showing the relation of the three plates as they come together.

Similar numerals refer to corresponding parts in the several views.

The numeral 10 indicates one of the parts or sections of the pedestal and the numeral 11 the other, the parts being similar. The parts of the pedestal support on their upper ends the table top 12 by means of suitable slides 13 which are supported on a Specification of Letters Patent.

Application filed June 1, 1909.

tially extended table top.

Patented J an. 25, 1910.

Serial No. 499,517.

bridge or top board 14 on the upper end of the pedestal parts. Bridge board 14 sup ports thereon a plate 15 which has pivotally attached thereto the slot cam lever 16. Slot cam lever 16 consists of the vertical portion 17 having slot 18 therein and the extended arm 19 to which is pivotall y attached a suit able draw bar 20, which may extend to the outer edge of the table. The draw bar 20 is not attached to the table top 12 or slides 13, but works indepeiident of them so that it is possible to extend the table top and slides without unlocking the pedestal. This is extremely convenient as well as providing a more sightly and firm support for a parhcn, however, the table top is given a full extension of the slide, it is necessary to provide intermediate supports therefor, and consequently the pedestal must be separated. This can be accomplished with my lock without taking out the filling board or leaves, by simply pushing upon the draw bar 20.

It is apparent that the movement of the slot cam lever 16, which is necessary to unlock the parts, is limited. ,"Xccordingly the movement of the pivotally mounted cam slot end is limited by means of the upturned lug 21 on plate 15, a notch 22 being provided in cam slot lever 16 having a curved side around which lug 21 passes as the cam end 17 is turned on the rivet 23. Lug 21 thereby forms a stop atthe bottom of notch 22 at. one extreme, as shown in Fig. 6, and against the side of the cam lever at the other cxti'eiue, as shown in Fig. 4. The slot cam 18 is preferably formed with an abrupt rise at the beginning or lower end of the slot so as to immediately raise the parts into conjunction, and a level locking upper end which will hold the rivet or stud 25 firmly in place when rivet 25 rises to the upper end of the slot 18, thereby clamping the parts together.

A vertical bar 24. is suspended from cam slot 18 by means of a rivet or stud 25 which is slidably mounted in said slot. Bar 24 extends down through a slot 26 in plate 15 within pedestal part 10. The lower end of the bar is bent in the form of a broad flange 27 so as to form a yoke to which is attached the two rods 28. To the lower end of rods 28 the locking elements or fingers 29 are pivotally attached at the point 30. Looking elements 29 are in turn pivotally attached at 31 to plates 32, which plates are attached to positive stop for the upward movement of locking element 29. The turned projection :33 of locking element 29 has a notch 35 there in next to the flat side of vertical plate 252. A hooked plate 36 is provided on part 11 opposite to plate 32 and is so placed that when the parts 10 and 11 are firmly drawn together making a close joint, as shown at 31' in Fig. 2, the hooked end 38 of plate so is turned opposite to projection 33 and will rest in notch 35 being drawn into said notch by the upward and sidewise movement of locking element 22); for it is apparent that when the two locking elements 29 are in the lowered position, as shown in Fig. 23, and the hooked elements 36 come over locking clements 29, the upward movement of the locking elements 29 by means of cam lever 1t will cause locking elements 29 to engage the hooked elements 36 and raise upward on said hooked elements drawing said hooked elements and at the same time said hooked ck ments will guide the parts of the pedestal 1t) and it firmly into conjunction. It is thus made obviou that the two locking elements 2!! pivotally attached to plates 32 on the opposite inner sides of the hollow por tion 10 of the pedestal and the (an-respondingly placed rigid hooked elements 36 draw lirmly together both sides oi the pedestal and also that the action of the locking elci ments 29 is to draw upwardly on both the sections it) and 11, thereby bringing the two parts of the pedestal into tan'rect locking position.

It should be borne in mind that the constant tendency of the parts of a split pedestal is to sag downward at the center, particularly when suppta'ted by branching legs, as shown at 39. This tendency increases with use as the joints become worn and the portions of the lock and table ofttimes become loose. On accountof this tendency to sag and also to insure the proper guidance of the portions 10 and 11 of the pedestal, dowel pins are commonly used between said portions. The rigid hooked elements 36 combined with notches on the locking elements 29 avoid the necessity of providing such dowel pins, which dowel pins quickly wear away the holes in the opposite part of the pedestal and make an unsightly joint. In order to insure the perfect adjustment of the parts so as to make a tight joint 37, the

upper ends of rods 28 are threaded and attached to flange Q7 of bar a l: by means of suitable nuts above and below said flange so that the upper end of rod may be ad justed, thereby tightening up the action of all the parts and insuring the perfect locking of the parts as well as a perfect joint 37 throughout the entire life of the. table.

It is apparent that the parts of the lock may be formed from sheet metal. by means of suitable dies so that with the exception of the rods 28 and bar :20 they may all be stamped. out by means of suitable die presses, thereby forming a simple, cheap, and durable construction, yet one which overcomes all the diliiculties thus vtar experienced in the use of split pedestals for extension tables. \Yhen placed upon the parts of the pedestal the locking elements are operated by drawing upon bar 20 as the two parts 10 and 1t approach one another. As soon as the hooks Ilb are engaged by the upward moving locking elements 25), the draw of the bar 20 and slot cam lever lti upon bar 24 and rods 2 lirmly closes the pedestal. The opening or unlocking of the pedestal is attained by simply pushing upon bar 20 thus operating by cam lever to the" remaining parts 01" the lock.

it is apparent that a central supporting post for long tables may be used within the parts 10 and 11 of the hollow pedestal, as shown in dotted line Fig. 1, since the parts of the lock operate upon the opposite inner sides of the pedestal, the rods 28 extending to the opposite inner sides from the vertical bar 24'. it is also obvious that other means might be used for raising the locking elements 29 than the slot cam lever to. The slot cam lever is preferred because oi its positive attachment and quick horizontal action. The locking elements 2%) with their upward draw and guiding principle for the two sections ol the pedestal are the main points necessary for the success of the look.

I claim as new:

i. in a device of the character described, the combination with a pedestal made of two sections, of. a locking element or finger pivotally attached at one end thereof to one of said pedestal sections, a projection on said linger out of line therewith, an element on the other pedestal section projecting into the path of rotation of said finger, and means connected to said projection to aise said finger and engage said projecting element and draw the pedestal se'et'ioi'is together with an u nvard and sidewise binding movement.

2. In a device of the character described the (JUIIlbllltttlOll with a pedestal made of two sectious,ot a lorkingelcment or finger pivotally attached at one end to one of said pedestal sections, a first projecting element on the same pedestal section as said finger placed above and in the path of rotation for said finger, a second rojecting element on the other pedestal sec tion in the path of rotation for said finger, a sidewise projection on said finger, and means pivotally attached to said sidewise projection for raising said finger to engage said second projecting element and bind it against said first project ing element.

3. In a device of the character described, the combination with a pedestal made up of two sections, of two plates attached to the opposite inner sides of one of said sections, said plates each projecting out from the Wall of said sections, a pair of locking elements each pivotally attached at one end to said plates and each havin an offset portion with a notch therein adjacent to said plate when in the raised or locking position, a pair of rigid hooked elements on the opposite inner sides of the other section one to each side to be engaged by said locking elements, and means connected to said offset portions for raising said locking elements to thereby enga c said hooked elements in said notches and raw said sections together.

4:. In a device of the character described, the combination with a pedestal made up of two sections, of plates attached to the opposite inner sides of one of said sections, one on each side, said plates having an angular projection, locking elements pivotally attached to said plates each having a corresponding angular projection to shut against the angular projection of said plate, plates rigidly attached to the opposite inner sides of the other section one for each side, each of said rigidly attached plates having an angular projection therefrom opposite to the angular projection of said pivotal locking element, and means for raising said pivotal locking elements to engage their angular projections with the angular projections of the plates on the opposite pedestal section.

5. In a device of the character described,

the combination with a pedestal made up of two sections, a pair of angular plates rigidly attached. Within one of said sections one on each side thereof, a pair of locking elements pivotally attached to said plates one to each plate and having corresponding angular projections, said pivotal locking elements each having a notch adjacent to said angular plate, plates rigidly attached to the other sec tion opposite said pivotal locking elements having projections therefrom with oppositely angled ends to form hooks, and means for raising said pivotal locking element to engage said hooks in looking engagement in said notches and guide the same against said angular plates, substantially as and for the purpose specified.

6. In a device of the character described, the combination with a pedestal made up of two sections 10 and 11, of a pair of angular plates 32 attached to the opposite inner sides of one of said sections one to each side, a pair of locking elements 29 pivotally attached to said plates, one to each plate and having a corresponding angular projection 33, each of said angular projections having a notch 35 adjacent to said angular plates,'

hooked plates 36 rigidly attached to the other section opposite said pivotal locking elements to engage said notches therein, rods 28 pivotally attached midway of the length of said locking elements at one end and adjustably attached to a yoke bar 24 at the other end, a cam lever 16 pivotally mounted on said pedestal having a cam slot 18 therein, and a stud 25 on said yoke bar slidably engaging said cam slot, substantially as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

ALFRED CARLSON.

Witnesses:

A. L. FURLoW, CARL T. JOHNSON. 

